the state or quality of being two or in two parts; dichotomy
2. physics
the principle that a wave-particle duality exists in microphysics in which wave theory and corpuscular theory are complementary. The propagation of electromagnetic radiation is analysed using wave theory but its interaction with matter is described in terms of photons. The condition of particles such as electrons, neutrons, and atoms is described in terms of de Broglie waves
3. geometry
the interchangeability of the roles of the point and the plane in statements and theorems in projective geometry
Examples of 'dualities' in a sentence
dualities
But not even these dualities proved enough.
The Times Literary Supplement (2018)
Second, there are all the terrible dualities of human politics.
Times, Sunday Times (2009)
She is particularly sharp on the us-and-them dualities of her childhood.
Times, Sunday Times (2008)
One of his dualities is that of public figure/ private thinker.
Times, Sunday Times (2006)
Yet the apparently accepted dualities of expat and local life all quickly come to seem perfectly 'normal'.